FLV to MP4 Converter

Convert old Flash Video (FLV) files to MP4. Modernize your video library for playback on phones, tablets, and HTML5 browsers.

4.5/5 - 720 votes

Drag & Drop FLV files

or click to browse from your device

Table of Contents

Convert FLV to MP4 - Escape From Flash

Modern browsers no longer support FLV. Convert your legacy Flash videos to MP4 to ensure they are preserved and playable everywhere.

1

Upload FLV

Select your .flv file. We accept files from old screen recorders, websites, and Flash archives.

2

Optimize

Leave settings on 'Recommended' to balance quality, or choose 'High Quality' for archives.

3

Download MP4

Get your modernized video file instantly. Ready for YouTube, iPhones, and the future.

Pro Tip: OBS Settings

Some older versions of OBS defaulted to saving as FLV to prevent corruption if the recording stopped. If you have a folder of these, convert them to MP4 to edit them in Premiere Pro.

Intelligence Inside

Why Use This Converter?

Flash is dead. Long live your video content.

Recover Memories

Many 2005-2015 era home videos were saved as FLV. Recover them before they become totally unreadable.

Modern Player Support

VLC can play FLV, but QuickTime and Windows Media Player cannot. MP4 works on all three.

HTML5 Ready

If you run a website, replace your old Flash embed codes with modern MP4 video tags.

Fast & Free

Our cloud servers process legacy codecs efficiently so you don't have to install slow software.

Format Breakdown
FeatureFLV (Flash)MP4 (Modern)
StatusObsolete (EOL 2020)Current Standard
Browser SupportNoneAll Browsers
Mobile PlaybackNoneNative
CodecsSorenson / VP6H.264 / AAC

Who Needs This?

Digital archivists, gamers with old recordings, and anyone with legacy web content.

Content Archivists

  • Convert old website assets
  • Preserve Flash animations (video)
  • Modernize backup libraries

Gamers & Streamers

  • Convert old OBS recordings
  • Edit gameplay in Premiere Pro
  • Upload legacy plays to YouTube

Educators

  • Fix broken course videos
  • Update LMS content
  • Make lessons playable on iPad

Happy Converters

See how others are saving their digital history.

"I had to update a client's site from 2009. Tons of FLV files. This tool saved me hours of work converting them for HTML5."

T
Tom H.
Web Developer

"Found my old Minecraft recordings from 2012 but they were all FLV. Converted them here and they look great on YouTube now."

J
Jessica M.
Streamer

"The only tool that correctly handled the audio sync on my old VP6 Flash videos. Excellent work."

R
Robert K.
Archivist
Engineering Philosophy

Resurrecting Flash.
Content Salvaged.

Flash Video (FLV) powered YouTube and the entire web video ecosystem for a decade. But when Adobe killed Flash Player in 2020, millions of video files essentially became digital bricks, unplayable on modern systems.

Our converter isn't just a transcoder; it's a digital preservation tool. It is engineered to read the proprietary Sorenson Spark and VP6 codecs buried inside FLV containers—codecs that most modern players have abandoned.

We meticulously extract the audio and video streams, decode them from their obsolete formats, and re-master them into the H.264 standard. This breathes new life into your content, making it 100% compatible with HTML5, iOS, and Android.

Legacy Restoration Engine

Preservation

Save obsolete Flash files from the digital void.

Mobiles

Play your old web clips on iPhone/Android.

No Plugins

Forget "Install Flash Player"

The End of Flash Video

For over a decade, FLV was the king of web video. If you watched a video on the internet between 2005 and 2015, it was likely an FLV file running in Adobe Flash Player. However, creating a proprietary plugin requirement for the open web was always a security risk and performance bottleneck.

Steve Jobs famously penned "Thoughts on Flash" in 2010, signaling the end. By 2020, Adobe officially End-of-Lifed (EOL) Flash, and browsers removed support entirely. Today, FLV files are orphaned artifacts. Converting them to MP4 is the only way to ensure they remain accessible.

Technical Brief

Parameter
Details
Impact
Container
Flash Video
MPEG-4 Part 14
Legacy Codec
Sorenson Spark (H.263)
AVC (H.264)
Plugin
Required (Flash)
None (Native)
Security
Vulnerable
Secure

How We Handle FLV Files

Converting FLV is tricky because of the variable framerates and proprietary audio often used.

  1. Ingest: We analyze the FLV header to identify whether it uses Sorenson Spark, VP6, or H.264.
  2. Transcode: We decode the stream frames. If the FLV already contains H.264 (common in later files), we can sometimes "remux" it without quality loss. If it uses older codecs, we re-encode to a modern H.264 profile.
  3. Audio Conversion: Many FLVs use ADPCM or MP3 audio. we convert this to AAC for maximum compatibility max volume levels.

Video Glossary

FLV

Flash Video. A container file format used to deliver digital video content over the Internet using Adobe Flash Player.

EOL

End of Life. The date when a vendor (Adobe) stops supporting or releasing updates for a product (Flash).

Sorenson Spark

An older video codec (H.263 variant) used in early Flash videos (YouTube 2005).

VP6

A proprietary video codec developed by On2 Technologies, used by Flash Player 8 and later.

Remuxing

Changing the container format (e.g., FLV to MP4) without re-encoding the audio/video streams.

OBS

Open Broadcaster Software. A free and open-source streaming app that often records to FLV.

Frequency Asked Questions

Secure Processing

We Don't Keep
Your Videos.

We understand that videos can be personal or confidential. That's why our system is built to forget.

Temporary Storage

Files exist only during processing and for a short download window (2 hours max).

Automated Wiping

No manual deletion needed. Our servers automatically purge old data.

Security Stats
SSL/TLS
Transport Security
100%
Automated Cleanup

About the Author

Author

Abu Nayem

SaaS Architect & Full Stack Dev

Building high-performance tools with Next.js and Python. Focused on privacy-first architecture and seamless UX.

ProfileContact